Steps to replicate the issue (include links if applicable):
- Clone MediaWiki master
- Install MediaWiki with some skin (e.g. Vector)
- Add $wgShowDebug = true; in LocalSettings.php
What happens?:
On each page, there is Debug data: and no debug log after.
What should have happened instead?:
On each page, there should be Debug data: and a long debug log after.
Software version (skip for WMF-hosted wikis like Wikipedia):
MediaWiki 1.40-alpha 6b7f2747714
Other information (browser name/version, screenshots, etc.):
Example of the bottom of the page: there is only the title "Debug log":
Example of the bottom of the page when this bug is fixed: there is the title "Debug log" and the beginning of the debug log:

